Improvement in hydrometers



H. PETmE.'l

H ydrometer. NQ.48,203. .Patented June 13, 1865. l

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UNITED STATES PATENT OEEICE.

HENRY PETRIE, OF` CHICAGO, ILLINOIS.

IMPROVEMEN'I IN HYDROMETERS.

Specification forming part of Letters Patent No. 48,203, dated June 13, 1865.

f reference being had to the annexed drawings,

making apart of this specification, in which--` Figure l is a perspective view, and showing Fahrenheits thermometer in the foreground. Fig. 2 is Tralles hydrometer. Figs. 3 and 4 represent dii'erent views of an adjustable bottom for the hydrometer case.

The object of my invention is to reduce the calculations of McGullochs tables for ascertaining the commercial value of spirituous liquors to a small and convenient form, so that they may be attached to the outside of the hydrometer-case, for convenience and easy reference; also, to so construct a hydrometer-case that its heavy bottom may be easily attached thereto or detached therefrom, and, when detached, both the case and bottom may be carl ried in the inspectors pockets without b eing cumbersome; also, to provide means for keeping the hydrometer-case in a perpendicular position while standing on a curved or uneven surface.

I construct my hydrometercase with a second or adjustable bottom, which is shown on the drawings by Figs. 3 and 4. l make this adjustable bottom large and heavy, and from one to two inches greater in diameter than the hydrometer-case proper. I adjust it to the hydrometer-casc by means of raised lips or grooves on its upper surface, into which the iianges on the bottom of the hydrometer-case proper may be easily slid. It may also be attached thereto bymeans of a raised lip or hook on one side, into which one edge or flange of the upper bottom may be hooked, and a spring on the opposite side, that catches over the side or ange and holds it securely. On the bottom of this adjustable bottom I fasten three balls or feet, arranged relatively with each other in the form of a triangle, each one of which occupies a corner thereof, as represen ted on Fig. 4 by the letters a a a. My object in making these three balls orfeet on said bottom is to secure a foothold or rest on the curved surface of a barrel or other vessel, and thereby secure a perpendicular position for the hydrometer with greater ease than could be done by using a bottom that is tlat on its lower surface.

I construct my table on brass, zinc, copper, paper, or other suitable substances by printing, stamping, or otherwise, and usually of the proper size to cover the circular portion ot' the hydrometencase when the same is attached thereto; or I may stamp it entire on the outer surface of said case. My said table is represented on Fig. 1 by the letter B. I arrange v my table by placing the figures representing the temperature by Fahrenheits thermometer on the top and bottom, and those indicating the results shown by Iralles hydrometer, I

place on the sides.

My method of calculation by this table is as follows: When the value of the liquor is shown by Tralles hydrometer and the temperature is ascertained by Fahrenheits thermometer,I take the lines of the figures thus indicated and trace them till they meet. I then take the figures found in the square where the said two lines meet and add them to the value indicated by the h5 drometer if that value is below sixty,

or I subtract them from said value it' the saine is above sixty. The result will always correspond with McCullochs tables. I extend this table, when desirable, so as to embrace all the igures on McCullochs tables from one to one hundred.

I do not Wish to be confined to the use of this table in any particular form or size. I may-make it large enough to cover the entire surface of the largest hydrometencase, except the face of the thermometer, orI may make it so small as only to cover a portion of such case. Myobjectin that regard is accomplished when I have succeeded in placing the said table before the inspector in the most convenient place and form possible for easy reference.

What I claim as new and 'of my invention, and desire to secure by Letters Patent, is

1. The adjustable bottom 3 and 4, when used for the purposes specified.

2. A hydrometer with the table B attached to the case thereof, substantially as set forth.

H. PETRIE.

Witnesses;

J. C; SMITH, FRED. B. GINN. 

